I like it. I thought towards the end of the season the writing improved quite a lot. I really enjoyed Batiatus and Lucretia's roles in the show. Admittedly, a lot of it is quite predictable, but it is based on historical events so its not like there's going to be crazy plot twists. (Though when Lucretia set-up Ilithia to unknowingly bang Spartacus, that was epic, how she couldn't tell the difference between him and Crixus' body sizes though... i'm not sure).
I am also enjoying this new season more as well. Gannicus is a mega badass, and I am excited to see Crixus' rise to champion.
Also, I find Spartacus to be one of the least interesting characters in the show too, which could be why I am liking this prequel season more since he's not there to be the good guy and dreaming about his wife all the time.